Shell structure of battery monomer, battery monomer, battery pack and power utilization device

Abstract

The utility model discloses a shell structure of a battery monomer, the battery monomer, a battery pack and an electric device, and relates to the technical field of batteries, the shell structure of the battery monomer comprises an end cover and a shell main body, the end cover and the shell main body are fixedly connected to jointly define a mounting cavity, and the shell main body is provided with a mounting wall; the mounting wall comprises a first wall part and a second wall part, the thickness of the first wall part is larger than that of the second wall part, the second wall part is arranged around the first wall part, and a mounting hole penetrating through the first wall part is formed in the first wall part; and the explosion-proof structure is arranged in the mounting hole and is fixedly connected with the first wall part. The second wall part is arranged around the first wall part, the mounting hole penetrating through the second wall part is formed in the first wall part, and the explosion-proof structure is arranged in the mounting hole and is fixedly connected with the first wall part, so that the design area of the explosion-proof structure is not limited by the size of the cover plate of the battery monomer, and the safety performance of the battery monomer is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell housing structure, a battery cell, a battery pack, and an electrical device. Background Technology

[0002] In related technologies, lithium batteries have been widely used in daily life due to their advantages such as high specific energy, high operating voltage, low self-discharge rate, and long cycle life. After thermal runaway occurs inside a battery cell, heat will continue to accumulate, causing the internal temperature of the battery to rise continuously, eventually leading to violent combustion and explosion. Therefore, it is necessary to design an explosion-proof structure to ensure the safety of battery cells. However, most existing explosion-proof structures are designed on the battery cover. The battery cover cannot provide enough area for the explosion-proof structure to explode, which is not conducive to the timely discharge of the explosion. Moreover, when a battery cell experiences thermal runaway, the ejected gas has a significant impact on the wiring harness on the battery module, greatly reducing the safety and reliability of the battery. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a battery cell casing structure that allows the design area of ​​the explosion-proof structure to be unrestricted by the size of the battery cell's cover, thereby improving the safety performance of the battery cell.

[0004] This invention further proposes a battery cell having the above-mentioned outer casing structure.

[0005] This utility model further proposes a battery pack having the above-mentioned battery cells.

[0006] This utility model further proposes an electrical device having the above-mentioned battery pack.

[0007] The battery cell housing structure according to an embodiment of the present invention includes: an end cap and a housing body, the end cap and the housing body being fixedly connected to jointly define a mounting cavity, the housing body having a mounting wall, the mounting wall including a first wall portion and a second wall portion, the thickness of the first wall portion being greater than the thickness of the second wall portion, the second wall portion being disposed around the first wall portion, the first wall portion having a mounting hole penetrating the first wall portion; and an explosion-proof structure disposed within the mounting hole and fixedly connected to the first wall portion.

[0008] According to the battery cell shell structure of this utility model embodiment, by providing a first wall and a second wall in the shell, the thickness of the first wall is greater than the thickness of the second wall, the second wall is arranged around the first wall, and the first wall forms a mounting hole that penetrates the second wall. The explosion-proof structure is disposed in the mounting hole and fixedly connected to the first wall, so that the design area of ​​the explosion-proof structure is not limited by the size of the battery cell cover plate, which is beneficial to improving the safety performance of the battery cell. It also allows the thinner shell body to meet the installation requirements of the explosion-proof structure, and allows the explosion-proof structure to be stably installed on the shell body. Furthermore, it can reduce the impact of the high-temperature gas ejected when the battery cell runs out of control on the internal wiring harness of the battery cell, thereby improving the safety and reliability of the battery cell.

[0009] According to some embodiments of the present invention, the explosion-proof structure and the mounting cavity are spaced apart, and the end face of the explosion-proof structure facing away from the mounting cavity is aligned with the end face of the first wall facing away from the mounting cavity.

[0010] According to some embodiments of the present invention, a support boss is formed on the inner wall of the mounting hole. The support boss is located on the side of the explosion-proof structure facing the mounting cavity, and the support boss abuts against the explosion-proof structure.

[0011] According to some embodiments of the present invention, the support boss is annular and extends circumferentially along the mounting hole.

[0012] According to some embodiments of the present invention, the end face of the support boss facing the mounting cavity and the end face of the first wall facing the mounting cavity are aligned.

[0013] According to some embodiments of the present invention, the distance between the mounting hole and the edge of the second wall is greater than or equal to 3 mm.

[0014] According to some embodiments of the present invention, the end face of the first wall portion facing the mounting cavity and the end face of the second wall portion facing the mounting cavity are aligned.

[0015] According to some embodiments of the present invention, the thickness of the first wall portion is D1, the thickness of the second wall portion is D2, and 0.2mm≤D1-D2≤1mm.

[0016] According to some embodiments of the present invention, the first wall portion and the second wall portion are integrally formed.

[0017] According to some embodiments of the present invention, the shell body includes: a side wall and an end wall, the end wall and the end cap are opposite to and spaced apart, the side wall is annular and connects the end cap and the end wall, and part of the end wall and / or the side wall is a mounting wall.

[0018] The battery cell according to the present invention includes the outer shell structure of the battery cell described in the above embodiments.

[0019] The battery pack according to an embodiment of the present invention includes the battery cells described in the above embodiments.

[0020] The electrical device according to an embodiment of the present invention includes the battery pack described in the above embodiment.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the outer shell structure of an embodiment of this utility model;

[0024] Figure 2 This is a partial cross-sectional view of the outer shell structure of the first embodiment of this utility model;

[0025] Figure 3 This is a partial cross-sectional view of the outer shell structure of the second embodiment of this utility model;

[0026] Figure 4 This is a schematic diagram of the outer shell structure of the third embodiment of this utility model;

[0027] Figure 5 This is a schematic diagram of the outer shell structure of the fourth embodiment of this utility model.

[0028] Figure label:

[0029] Shell structure 100;

[0030] Shell body 10; mounting cavity 11;

[0031] Mounting wall 20; First wall portion 21; Second wall portion 22; Mounting hole 23; Support boss 24; Narrow side wall 25; Wide side wall 26;

[0032] Explosion-proof structure 30. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] The following is for reference. Figures 1-5The present invention describes the housing structure 100 of a battery cell, the battery cell, the battery pack, and the power-consuming device according to embodiments of the present invention.

[0035] like Figures 1-5 As shown, the battery cell housing structure 100 according to an embodiment of the present invention includes: an end cap and a housing body 10, the end cap and the housing body 10 being fixedly connected to jointly define a mounting cavity 11, the housing body 10 having a mounting wall 20, the mounting wall 20 including a first wall portion 21 and a second wall portion 22, the thickness of the first wall portion 21 being greater than the thickness of the second wall portion 22, the second wall portion 22 being disposed around the first wall portion 21, the first wall portion 21 having a mounting hole 23 penetrating the first wall portion 21; and an explosion-proof structure 30, the explosion-proof structure 30 being disposed within the mounting hole 23 and fixedly connected to the first wall portion 21.

[0036] The shell body 10 can be made of metal materials, such as aluminum, steel, etc. This application takes the shell body 10 being made of aluminum as an example. Aluminum has good processing performance and high strength, which can provide sufficient protection for the battery cell to ensure the normal operation of the battery cell.

[0037] The end cap and the housing body 10 are fixedly connected to jointly define the mounting cavity 11. The mounting cavity 11 is used to mount the electrode assembly of the battery cell, protecting the electrode assembly from damage caused by external impacts, vibrations, and compression, thereby improving the performance and lifespan of the battery cell. The housing body 10 has a mounting wall 20, which includes a first wall portion 21 and a second wall portion 22. The mounting wall 20 can be constructed as a narrow sidewall 25 of the housing body 10. The thickness of the first wall portion 21 is greater than the thickness of the second wall portion 22. The first wall portion 21 can protrude beyond the outer surface of the second wall portion 22, enhancing the strength and rigidity of the first wall portion 21 so that it can withstand greater pressure or stress. The second wall portion 22 surrounds the first wall portion 21. The first wall portion 21 has a mounting hole 23 penetrating through it. The thickness of part 21 is greater than that of the second wall part 22, which can form a mounting hole 23 with sufficient space for positioning and installing the explosion-proof structure 30. This not only provides a stable and reliable foundation for the installation of the explosion-proof structure 30, but also allows the thinner shell body 10 to meet the installation requirements of the explosion-proof structure 30 without increasing the thickness of the entire mounting wall 20. It also allows the explosion-proof structure 30 to be firmly installed on the shell body 10, and the design area of ​​the explosion-proof structure 30 is not limited by the size of the end cap of the battery cell, which is beneficial to improving the safety performance of the battery cell.

[0038] As an example of this application, the explosion-proof structure 30 can be an explosion-proof valve, an explosion-proof membrane, etc. This application uses an explosion-proof valve as an example to illustrate the explosion-proof structure 30. When the internal air pressure of the battery cell rises to a certain level, the explosion-proof valve will automatically open to release the internal pressure of the battery cell, thereby preventing the outer casing structure 100 from bursting due to excessive pressure. The explosion-proof structure 30 is disposed in the mounting hole 23 and fixedly connected to the first wall portion 21. For example, the explosion-proof structure 30 and the first wall portion 21 can be fixedly connected by welding, or the explosion-proof structure 30 and the first wall portion 21 can be fixedly connected by adhesive. However, this utility model is not limited to these methods. The explosion-proof structure 30 and the first wall portion 21 can also be fixedly connected by other methods, as long as the explosion-proof structure 30 is disposed in the mounting hole 23 and fixedly connected to the first wall portion 21. This application uses the laser welding connection between the explosion-proof structure 30 and the first wall portion 21 as an example for illustration. Laser welding can firmly connect the explosion-proof structure 30 and the outer shell structure 100 together, which not only better resists external impacts and vibrations, improving the stability and safety of the battery cell, but also effectively prevents the explosion-proof structure 30 from loosening or falling off during use. It also achieves a seal between the explosion-proof structure 30 and the outer shell structure 100, effectively preventing leakage of the medium inside the battery cell, thus improving the safety performance of the battery cell and consequently enhancing its safety and reliability. Furthermore, the outer shell structure 100 is simple and easy to use, which helps reduce the manufacturing cost of the outer shell structure 100.

[0039] As an example of this application, the mounting wall 20 may include multiple first wall portions 21, and each of the multiple first wall portions 21 is formed with a mounting hole 23 penetrating through the first wall portion 21. Multiple explosion-proof structures 30 can be installed in the corresponding mounting holes 23, thereby enabling the installation of multiple explosion-proof structures 30 on the outer casing structure 100. It can be explained that the number, position, and size of the first wall portions 21, mounting holes 23, and explosion-proof structures 30 can be rationally designed according to the gas generation capacity of the battery cell during thermal runaway, so that the explosion capability of the explosion-proof structure 30 matches the venting capacity of the battery cell, thereby reducing the risk of the outer casing structure 100 exploding. Furthermore, compared with the prior art of setting explosion-proof structures on the cover plate of the battery cell, this application, by installing explosion-proof structures 30 on the outer casing structure 100, can reserve more space on the cover plate of the battery cell (i.e., the end cap in the above embodiment) for the design of the electrode post, and can also provide sufficient space for the lead-out tabs, which is beneficial to improving the current carrying capacity of the battery cell.

[0040] According to the battery cell housing structure 100 of this utility model embodiment, by providing a first wall portion 21 and a second wall portion 22 in the housing, the thickness of the first wall portion 21 is greater than the thickness of the second wall portion 22, the second wall portion 22 is arranged around the first wall portion 21, and the first wall portion 21 forms a mounting hole 23 that penetrates the second wall portion 22. The explosion-proof structure 30 is disposed in the mounting hole 23 and fixedly connected to the first wall portion 21, so that the design area of ​​the explosion-proof structure 30 is not limited by the size of the battery cell cover plate, which is beneficial to improving the safety performance of the battery cell. It also allows the thinner housing body 10 to meet the installation requirements of the explosion-proof structure 30, and allows the explosion-proof structure 30 to be stably installed on the housing body 10. Furthermore, it can reduce the impact of high-temperature gas ejected when the battery cell runs out of control on the internal wiring harness of the battery cell, thereby improving the safety and reliability of the battery cell.

[0041] According to some embodiments of the present invention, such as Figure 2 As shown, the explosion-proof structure 30 and the mounting cavity 11 are spaced apart, and the end face of the explosion-proof structure 30 facing away from the mounting cavity 11 is aligned with the end face of the first wall portion 21 facing away from the mounting cavity 11.

[0042] Among them, such as Figure 2 As shown, in the first embodiment of the housing structure 100 of this application, the explosion-proof structure 30 and the mounting cavity 11 are separated, which enables the explosion-proof structure 30 to be in no contact with the electrode assembly (i.e., bare cell) in the mounting cavity 11. This avoids scratches or damage to the electrode assembly that the explosion-proof structure 30 may cause during operation or when subjected to external force, thereby maintaining the integrity of the electrode assembly. The no-contact design between the explosion-proof structure 30 and the electrode assembly fundamentally eliminates the possibility of direct conduction between the positive and negative electrodes of the electrode assembly, thereby greatly reducing the risk of short circuit in the battery cell. This, in turn, greatly reduces the risk of battery cell damage, fire, and explosion, and improves the safety and reliability of the battery cell.

[0043] Furthermore, the end face of the explosion-proof structure 30 facing away from the mounting cavity 11 and the end face of the first wall portion 21 facing away from the mounting cavity 11 are aligned. With this arrangement, when the explosion-proof structure 30 is installed into the mounting hole 23, the alignment of the end face of the explosion-proof structure 30 facing away from the mounting cavity 11 and the end face of the first wall portion 21 facing away from the mounting cavity 11 indicates that the explosion-proof structure 30 is installed in place. This facilitates the determination of whether the explosion-proof structure 30 is installed correctly, making the installation process of the explosion-proof structure 30 simpler and faster, thereby reducing the installation difficulty and cost of the explosion-proof structure 30. It can also reduce the risk of leakage caused by unevenness or misalignment of the interface of the mounting wall 20, and allow the explosion-proof structure 30 and the first wall portion 21 to distribute the load more evenly when subjected to force, thereby enhancing the stability and strength of the entire structure and improving the appearance quality of the outer shell structure 100.

[0044] According to some embodiments of the present invention, such as Figure 3As shown, a support boss 24 can be formed on the inner wall of the mounting hole 23. The support boss 24 is located on the side of the explosion-proof structure 30 facing the mounting cavity 11, and the support boss 24 abuts against the explosion-proof structure 30.

[0045] Among them, such as Figure 3 As shown, in the second embodiment of the housing structure 100 of this application, based on the first embodiment of the housing structure 100, a support boss 24 can also be formed on the inner sidewall of the mounting hole 23. The support boss 24 is located on the side of the explosion-proof structure 30 facing the mounting cavity 11, and the support boss 24 abuts against the explosion-proof structure 30. Specifically, when the explosion-proof structure 30 is installed in the mounting hole 23, the wall surface of the explosion-proof structure 30 facing the mounting cavity 11 abuts against the support boss 24, so that the support boss 24 provides support for the explosion-proof structure 30. The support boss 24 can effectively distribute and bear the weight or pressure of the explosion-proof structure 30, and can also limit the explosion-proof structure 30, thereby preventing the explosion-proof structure 30 from moving into the mounting cavity 11 when it falls off from the first wall portion 21. This further prevents the explosion-proof structure 30 from contacting the electrode assembly in the mounting cavity 11, thereby significantly improving the safety and reliability of the housing structure 100.

[0046] According to some embodiments of the present invention, the support boss 24 can be annular and extends circumferentially along the mounting hole 23, thereby enabling the support boss 24 to provide uniform support force on the circumference of the explosion-proof structure 30, which helps to disperse the weight and pressure of the explosion-proof structure 30, prevent local overload and stress concentration, and help improve the stability and safety of the outer shell structure 100. Furthermore, the annular support boss 24 can provide a continuous sealing surface between the explosion-proof structure 30 and the mounting hole 23, which can achieve a good sealing effect and prevent leakage of battery cells.

[0047] According to some embodiments of the present invention, such as Figure 2 As shown, the end face of the support boss 24 facing the mounting cavity 11 and the end face of the first wall portion 21 facing the mounting cavity 11 are aligned. That is, the end face of the support boss 24 facing the mounting cavity 11 and the end face of the first wall portion 21 facing the mounting cavity 11 are coplanar, and the support boss 24 and the first wall portion 21 can be integrally formed. This arrangement can prevent the wall surface of the mounting wall 20 facing the mounting cavity 11 from forming sharp edges, thereby preventing the sharp edges from scratching the electrode assembly and providing a safe and reliable installation environment for the electrode assembly. It can also make the support boss 24 and the first wall portion 21 uniformly bear the pressure or load from the inside or outside of the mounting cavity 11 as a whole, which helps to enhance the overall stability and durability of the mounting wall 20, and also makes the inner wall of the mounting cavity 11 neat and orderly.

[0048] According to some embodiments of this utility model, the distance between the edges of the mounting hole 23 and the second wall portion 22 is greater than or equal to 3mm. For example, the distance between the edges of the mounting hole 23 and the second wall portion 22 can be 3mm, 4mm, 5mm, 6mm, etc., but this utility model is not limited to this. The distance between the edges of the mounting hole 23 and the second wall portion 22 can also be other values, as long as the distance between the edges of the mounting hole 23 and the second wall portion 22 is greater than or equal to 3mm. Sufficient distance can reduce stress concentration at the edges of the mounting hole 23 and improve the structural strength of the edges of the mounting hole 23, which is beneficial to improving the overall strength and stability of the shell structure 100. In addition, it can also improve the welding effect between the explosion-proof structure 30 and the shell body 10, making the explosion-proof structure 30 more reliably installed on the shell body 10. It should be noted that the upper limit of the distance between the edges of the mounting hole 23 and the second wall portion 22 can be reasonably selected and set according to the actual situation.

[0049] According to some embodiments of the present invention, the end face of the first wall portion 21 facing the mounting cavity 11 and the end face of the second wall portion 22 facing the mounting cavity 11 are aligned. That is, the end face of the first wall portion 21 facing the mounting cavity 11 and the end face of the second wall portion 22 facing the mounting cavity 11 are coplanar, and the first wall portion 21 and the second wall portion 22 can be integrally formed. This arrangement can prevent the wall surface of the mounting wall 20 facing the mounting cavity 11 from forming sharp corners, thereby preventing the sharp corners from scratching the electrode assembly, providing a safe and reliable installation environment for the electrode assembly, and also enabling the first wall portion 21 and the second wall portion 22 to uniformly bear the pressure or load from the inside or outside of the mounting cavity 11 as a whole, which helps to enhance the overall stability and durability of the mounting wall 20, and also makes the inner wall of the mounting cavity 11 neat and orderly.

[0050] According to some embodiments of the present invention, such as Figure 3 As shown, the thickness of the first wall portion 21 is D1, and the thickness of the second wall portion 22 is D2, with 0.2mm ≤ D1 - D2 ≤ 1mm.

[0051] The thickness of the first wall portion 21 can be D1, and the thickness of the second wall portion 22 can be D2. The difference between the thickness of the first wall portion 21 and the thickness of the second wall portion 22 is D1-D2. The value of D1-D2 can be any value between 0.2mm, 1mm, and 0.2mm-1mm. For example, the value of D1-D2 can be 0.2mm, 0.51mm, 0.6mm, 1mm, etc. However, this utility model is not limited to this. The value of D1-D2 can also be other values ​​between 0.2mm-1mm, as long as the difference between the thickness of the first wall portion 21 and the thickness of the second wall portion 22, D1-D2, satisfies 0.2mm≤D1-D2≤1mm.

[0052] The difference between the thickness of the first wall portion 21 and the thickness of the second wall portion 22, D1-D2, satisfies 0.2mm≤D1-D2≤1mm. This makes the difference between the thickness of the first wall portion 21 and the thickness of the second wall portion 22 relatively small. This not only allows for the installation of the explosion-proof structure 30 on the first wall portion 21 to meet the explosion-proof performance without increasing the overall weight, but also maintains the original shape of the outer shell structure 100 as much as possible. This avoids changing the original assembly method of the outer shell structure 100, thereby reducing the assembly complexity of the battery cell.

[0053] According to some embodiments of the present invention, the first wall portion 21 and the second wall portion 22 can be integrally formed. The integrally formed first wall portion 21 and the second wall portion 22 have no seams or connectors, thus forming an integral load-bearing structure, which can better resist external impacts and vibrations, improve the overall strength and rigidity of the shell structure 100, and the integral design can reduce stress concentration points at the connection, improve the stability and durability of the shell structure 100, thereby improving the safety and reliability of the battery cell, and making the inner and outer walls of the mounting wall 20 smooth and neat, thereby avoiding the formation of sharp edges and steps on the mounting wall 20 that could scratch the electrode assembly in the mounting cavity 11.

[0054] According to some embodiments of the present invention, the shell body 10 includes: a side wall and an end wall, the end wall and the end cap are opposite to and spaced apart, the side wall is annular and connects the end cap and the end wall, and part of the end wall and / or the side wall is configured as a mounting wall 20.

[0055] The shell body 10 may include: a side wall and an end wall, the end wall and the end cap being opposite to and spaced apart, the side wall being annular and connecting the end cap and the end wall, the annular side wall, the end wall and the end cap together defining the mounting cavity 11.

[0056] Parts of the end wall and / or side wall are configured as mounting walls 20. For example, a portion of the end wall is configured as a mounting wall 20, or a portion of the side wall is configured as a mounting wall 20, or both portions of the end wall and side wall are configured as mounting walls 20. This application uses a portion of the side wall being configured as a mounting wall 20 as an example for illustration. Further, the side wall may include a narrow side wall 25 and a wide side wall 26. The narrow side wall 25 can be configured as a mounting wall 20 for mounting the explosion-proof structure 30. Specifically, at least one first wall portion 21 is formed in the narrow side wall 25 for mounting the explosion-proof structure 30, and the shape of the mounting hole 23 can be racetrack-shaped, circular, or other shapes, which can be reasonably designed according to actual needs. Furthermore, the shape of the outer shell structure 100 can be rectangular, hexagonal prism, or other shapes, which can be reasonably set according to actual needs.

[0057] Therefore, there is enough space on the side wall of the outer casing structure 100 to provide more and larger mounting holes 23 for mounting the explosion-proof structure 30. When the battery cell thermally runs away, there are enough explosion-proof structures 30 to quickly burst and release pressure. And since the explosion-proof structure 30 is located on the casing body 10, it can reduce the impact of the high-temperature gas ejected when the battery cell runs away on the wiring harness inside the battery cell, thereby improving the safety and reliability of the battery cell.

[0058] like Figure 4 As shown, in the third embodiment of this application, the outer shell structure 100 may be provided with a plurality of first wall portions 21, each of which may be provided with a racetrack-shaped mounting hole 23, and a racetrack-shaped explosion-proof structure 30 may be installed in the corresponding mounting hole 23.

[0059] like Figure 5 As shown in the fourth embodiment of this application, the mounting hole 23 on the outer casing structure 100 can be circular, and a circular explosion-proof structure 30 can be installed in the corresponding mounting hole 23. However, this utility model is not limited to this, and the mounting hole 23 and the explosion-proof structure 30 can also be set to other shapes. The number, position, and size of the first wall portion 21, the mounting hole 23, and the explosion-proof structure 30 can be reasonably designed according to the gas generation capacity of the battery cell during thermal runaway, so that the explosion capability of the explosion-proof structure 30 matches the venting capacity of the battery cell, thereby reducing the risk of the outer casing structure 100 exploding.

[0060] According to the battery cell of the present invention, including the outer shell structure 100 of the battery cell of the above embodiment, the design area of ​​the explosion-proof structure 30 is not limited by the size of the cover plate of the battery cell, which is beneficial to improving the safety performance of the battery cell. It also enables the thinner shell body 10 to meet the installation requirements of the explosion-proof structure 30, and enables the explosion-proof structure 30 to be stably installed on the shell body 10. Furthermore, it can reduce the impact of the high-temperature gas ejected when the battery cell runs out of control on the wiring harness inside the battery cell, thereby improving the safety and reliability of the battery cell.

[0061] The battery pack according to the present invention includes the battery cells of the above embodiments, so that the design area of ​​the explosion-proof structure 30 is not limited by the size of the cover plate of the battery cell, which is beneficial to improving the safety performance of the battery cell, and also allows the thinner shell body 10 to meet the installation requirements of the explosion-proof structure 30. It also allows the explosion-proof structure 30 to be stably installed on the shell body 10, and can reduce the impact of the high-temperature gas ejected when the battery cell runs out of control on the wiring harness inside the battery cell, thereby improving the safety and reliability of the battery cell.

[0062] The electrical device according to the present invention includes the battery pack of the above embodiment, so that the design area of ​​the explosion-proof structure 30 is not limited by the size of the cover plate of the battery cell, which is beneficial to improving the safety performance of the battery cell, and also enables the thinner shell body 10 to meet the installation requirements of the explosion-proof structure 30. It also enables the explosion-proof structure 30 to be stably installed on the shell body 10, and can reduce the impact of the high temperature gas ejected when the battery cell runs out of control on the wiring harness inside the battery cell, thereby improving the safety and reliability of the battery cell.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A casing structure (100) for a single battery cell, characterized in that, include: An end cap and a shell body (10) are fixedly connected to define a mounting cavity (11). The shell body (10) has a mounting wall (20), which includes a first wall portion (21) and a second wall portion (22). The thickness of the first wall portion (21) is greater than the thickness of the second wall portion (22). The second wall portion (22) is disposed around the first wall portion (21). The first wall portion (21) has a mounting hole (23) that penetrates the first wall portion. An explosion-proof structure (30) is provided in the mounting hole (23) and fixedly connected to the first wall portion (21).

2. The casing structure (100) of the battery cell according to claim 1, characterized in that, The explosion-proof structure (30) and the mounting cavity (11) are spaced apart, and the end face of the explosion-proof structure (30) facing away from the mounting cavity (11) is aligned with the end face of the first wall portion (21) facing away from the mounting cavity (11).

3. The casing structure (100) of the battery cell according to claim 1, characterized in that, The inner wall of the mounting hole (23) is formed with a support boss (24), which is located on the side of the explosion-proof structure (30) facing the mounting cavity (11), and the support boss (24) and the explosion-proof structure (30) abut against each other.

4. The casing structure (100) of the battery cell according to claim 3, characterized in that, The support boss (24) is annular and extends circumferentially along the mounting hole (23).

5. The casing structure (100) of the battery cell according to claim 3, characterized in that, The end face of the support boss (24) facing the mounting cavity (11) is aligned with the end face of the first wall portion (21) facing the mounting cavity (11).

6. The casing structure (100) of the battery cell according to claim 1, characterized in that, The distance between the mounting hole (23) and the edge of the second wall portion (22) is greater than or equal to 3 mm.

7. The casing structure (100) of the battery cell according to claim 1, characterized in that, The end face of the first wall portion (21) facing the mounting cavity (11) and the end face of the second wall portion (22) facing the mounting cavity (11) are aligned.

8. The casing structure (100) of the battery cell according to any one of claims 1-7, characterized in that, The thickness of the first wall portion (21) is D1, and the thickness of the second wall portion (22) is D2, 0.2mm≤D1-D2≤1mm.

9. The casing structure (100) of the battery cell according to any one of claims 1-7, characterized in that, The first wall portion (21) and the second wall portion (22) are integrally formed.

10. The casing structure (100) of the battery cell according to any one of claims 1-7, characterized in that, The shell body (10) includes: a side wall and an end wall, the end wall and the end cap being opposite to and spaced apart, the side wall being annular and connecting the end cap and the end wall, and a portion of the end wall and / or the side wall being constructed as the mounting wall (20).

11. A single battery cell, characterized in that, Includes the housing structure (100) of the battery cell according to any one of claims 1-10.

12. A battery pack, characterized in that, Includes the battery cell according to claim 11.

13. An electrical appliance, characterized in that, Includes the battery pack according to claim 12.

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